已知x的绝对值=1,y的绝对值=2分之1,则（x的20次方）³-x³y²的值等于?
人气：394 ℃ 时间：2019-10-10 04:21:28
解答
x=±1
y=±1/2
所以原式=1³-(±1)³×1/4
=1±1/4
=3/4或5/4
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